As per title.

Do you feel that old content -- be it zone design, leveling hubs, open-world systems, guilds, economic systems, leves, FATEs, behests, guildhests, or the like -- that will not have direct* impact on level 70+ content is worth revising?
* It may have an impact insofar as prototyping and testing tech for later additions in 70+ content.
If so, how would you excuse the development time spent on it?
When and how would you get players to go back to the remastered areas to see the improvements? For what reasons would most players not only appreciate these changes, but the time spent seeing the improved content? What sort of banner-worthy or sales-point addition to the game would include and vanguard these changes? What roadmap seems sensible for deploying and excusing the work done?